EP2678198B1 - Method for producing wiper blades and wiper blade for wiping panes - Google Patents

Method for producing wiper blades and wiper blade for wiping panes Download PDF

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Publication number
EP2678198B1
EP2678198B1 EP12705835.2A EP12705835A EP2678198B1 EP 2678198 B1 EP2678198 B1 EP 2678198B1 EP 12705835 A EP12705835 A EP 12705835A EP 2678198 B1 EP2678198 B1 EP 2678198B1
Authority
EP
European Patent Office
Prior art keywords
wiper blade
heat treatment
supporting element
heat
wiper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP12705835.2A
Other languages
German (de)
French (fr)
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EP2678198A1 (en
Inventor
Wolfgang Endres
Ruddy Crabbe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP2678198A1 publication Critical patent/EP2678198A1/en
Application granted granted Critical
Publication of EP2678198B1 publication Critical patent/EP2678198B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
    • B60S1/38—Wiper blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
    • B60S1/38—Wiper blades
    • B60S1/3848—Flat-type wiper blade, i.e. without harness
    • B60S1/3849—Connectors therefor; Connection to wiper arm; Attached to blade
    • B60S1/3851—Mounting of connector to blade assembly
    • B60S1/3855—Mounting of connector to blade assembly by welding, gluing or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
    • B60S1/38—Wiper blades
    • B60S1/3848—Flat-type wiper blade, i.e. without harness
    • B60S1/3874—Flat-type wiper blade, i.e. without harness with a reinforcing vertebra
    • B60S1/3875—Flat-type wiper blade, i.e. without harness with a reinforcing vertebra rectangular section
    • B60S1/3879—Flat-type wiper blade, i.e. without harness with a reinforcing vertebra rectangular section placed in side grooves in the squeegee
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
    • B60S1/38—Wiper blades
    • B60S1/3848—Flat-type wiper blade, i.e. without harness
    • B60S1/3886—End caps
    • B60S1/3896—End caps with openings at the longitudinal extremities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
    • B60S1/38—Wiper blades
    • B60S2001/3898—Wiper blades method for manufacturing wiper blades
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/49865—Assembling or joining with prestressing of part by temperature differential [e.g., shrink fit]

Definitions

  • the support element is intended to ensure the most uniform possible distribution of the wiper blade contact pressure on the windshield over the entire wiping area swept by the wiper blade. Due to a corresponding curvature of the unloaded support element - i.e. when the wiper blade is not in contact with the window - the ends of the wiper strip, which is fully applied to the window during operation of the wiper blade, are loaded by the then tensioned support element to the window, even if the radii of curvature differ from spherical curved vehicle windows change at each wiper blade position. The curvature of the wiper blade must therefore be somewhat greater than the greatest curvature measured in the wiping field on the windshield to be wiped.
  • a connection device is attached to the support element, via which the connection to the wiper arm is established.
  • connection device fastens the connection device to the support element by means of a welded connection.
  • the connecting element on the wiper blade side which is either made of metal or a plastic, is applied or pushed onto the support element and bonded to the support element by means of resistance welding in the case of a metal connecting element or by means of ultrasonic welding in the case of a plastic connecting element.
  • This welded connection is exposed to extreme conditions in everyday life and has to withstand high torques and vibrations even in different weather conditions.
  • a welded connection places high quality requirements on the process management, especially with wiper blades manufactured in large numbers, and thus makes the wiper blade more expensive, which should be avoided especially with mass-produced products.
  • a method according to the preamble of claim 1 is for example from DE 10 2009 002 411 A1 known. Further prior art is from WO 2005/102801 A1 known.
  • the method according to the invention for producing a wiper blade according to claim 1 has the advantage that the wiper blade can be produced very inexpensively.
  • the support element consists of drawn or rolled rails, which can be obtained at no cost within narrow tolerances, while the part on the wiper blade side is folded or injection-molded from sheet metal. In this case, too, the necessary tolerances can be easily represented.
  • heat treatment takes place after the parts have been joined, it is not necessary to pay attention to very tight tolerances. The heat treatment ensures that the elements of the support element and the part on the wiper blade side are in close contact with one another and create at least a non-positive bond. A corresponding surface quality or choice of material can also ensure that the parts claw into one another or even stick together.
  • the heat treatment preferably acts on claw-like attachments of the part on the wiper blade side, which change in their shape and / or expansion in such a way that they lie tightly against the support element.
  • the heat treatment is directed to the support element, in particular to the lower side of the support element, the heat acts from the inside and thus directly in the contact area between the support element and the part on the wiper blade side and thus improves the bond.
  • the heat can be brought in particularly easily if it is directed in the form of blown hot air onto the areas that are to be heated.
  • the heat treatment can take place in the form of thermal radiation.
  • the heat treatment is carried out by means of a hot plate, this can only be kept at a distance from the parts to be expected or can also come into direct contact. In the latter case, it is possible to have a shaping effect on the elements of the support element and / or the part of the connection device on the wiper blade side and to improve the bond.
  • the heat treatment can be carried out very gently using a heat bath through which at least the parts to be heated are drawn.
  • the support element can be placed in a heating furnace.
  • the heated parts are preferably processed in a shaping manner, in particular pressed onto one another. This reduces the gap and there is a force-fit and / or form-fit connection.
  • the heated parts can already be cooled, so that a stepping shape is achieved.
  • connection between the support element and the part of the connection device on the wiper blade side can be improved if a substance is introduced into the area between these parts which hardens and / or swells and / or sticks during the heat treatment. This material can then claw into the smallest cracks and improve the bond considerably.
  • the application of the wiper blade-side part of the connection device to the support element, in particular before the heat treatment, is particularly easy if the support element consists of two spaced apart spring rails or has those that are placed against one another before the wiper blade-side part is pushed on and after the wiper-blade-side part has been positioned on the brought specific distance, so in particular are pushed apart.
  • a wiper blade according to the invention for wiping windows with the features of claim 14 has the advantage that it can be produced very easily because the connection between the support element and the part of the connection device on the wiper blade side is significantly improved by a heat treatment in this area. This is particularly important because during the wiping operation, especially when the windshield is dry or when there is snow on the windshield, considerable torques prevail between the support element and the part of the connection device on the wiper blade side. These torques are also not constant but change regularly.
  • Tolerance band from 0 mm to 0.5 mm, preferably from 0 mm to 0.2 mm, but at least from 0 mm to 0.5 mm.
  • the dimensional accuracy of the arrangement can easily be maintained if the spaced apart spring rails are covered at their ends by end caps, at least one end cap having a spacer.
  • connection device has run-up bevels in the area of the lugs, so that easy threading of the spring rails in this area is guaranteed.
  • Figure 1 a wiper blade according to the invention in a perspective illustration with a wiper arm indicated by dash-dotted lines and a surface of a windshield indicated by dash-dotted lines
  • Fig. 2 shows a view according to II-II in FIG Fig. 1
  • Fig. 3 a schematic representation of the view Fig. 2 with only one spring rail
  • Fig. 4 a schematic view in viewing direction IV in Fig. 1 with only one end cap
  • Fig. 5 a schematic view accordingly Fig. 2 an embodiment with a hot air blower
  • Fig. 6 corresponding Fig. 5 with a source of thermal radiation
  • Fig. 7 corresponding Fig. 5 with an induction heating unit
  • Fig. 8 corresponding Fig. 5 with a heating surface
  • Fig. 9 corresponding Fig. 5 in a heating furnace
  • Fig. 10 a schematic side view of a wiper blade according to the invention in a heating bath.
  • the wiper blade 10 shown has a band-like elongated, resilient support element 12 ( Figures 1 and 2 ), on whose lower hinge side 13 facing the window an elongated, rubber-elastic wiper strip 14 is attached parallel to the longitudinal axis.
  • the wiper blade-side part 15 of a connection device is arranged in its central section, with the aid of which the wiper blade 10 is articulated with an in Figure 1
  • the wiper arm 16 indicated by dash-dotted lines can be releasably connected.
  • the support element 12 is constructed from two spring strips 28 and 30 which are separate from one another and which are spaced apart from one another and form a gap 32.
  • the connection device 15 has two U-shaped receptacles 34 and 36, in which the spring strips 28 and 30 are received.
  • the receptacles 34 and 36 each encompass the spring strips 28 and 30 over a larger part of their cross-section, the part of the connection device 15 corresponding to the wiper arm 16 being arranged on the convex side 29 of the support element 12, while the concave side 31 lies opposite it.
  • connection device 15 is shown schematically, the corresponding spring strip 28 being drawn in the receptacle 34, while the spring strip 30 is not located in the corresponding receptacle 36 so that the clear width 42 can be seen. It can be seen that the receptacles 34 and 36 suitably encompass the spring strips 28 and 30, the present tolerances being discussed later.
  • the connection device 15 has a recess 40 in which a head part of a wiper strip 14 comes to rest when the wiper blade 10 is assembled.
  • FIG. 4 The wiper blade 10 shown from below, which is drawn without the wiper strip 14 or wiper lip 26, shows the spring strips 28 and 30, the gap 32 and the receptacles 34 and 36 of the connection device 15. It can be seen that in this embodiment of the wiper blade 10 the Spring strips 28 and 30 completely apart are separated and only by the connection device 15 or via end caps 38, of which in Fig. 4 only one drawn on one end must be held together. At least one of the end caps 38 has a spacer 39 which, in the assembled state, holds the spring strips 28, 30 at the spacing of the gap 32.
  • the part 15 of the connection device 20 on the wiper blade side is pushed onto the support element 12, for which the part 15 on the wiper blade side has a clear width 42 in the region of the receptacles 34, 36 which is equal to or slightly greater than the thickness of the spring strips 28, 30.
  • the clear width is approximately 0 mm to at least 0.05 mm larger than the thickness of the spring strips 28, 30. Assembly is easier if the permissible tolerance range is in the range from 0 mm to 0.2 mm, but then there are increased demands on the heat treatment. A very simple assembly can take place if the tolerance band is between 0 mm and 0.5 mm, in which case it can be assumed that additional measures to reduce the gap are necessary after the heat treatment.
  • the assembly of the wiper blade-side part 15 on the spring strips 28, 30 is to be carried out in such a way that the spring strips 28, 30 are held next to one another in the clear widths while reducing the gap 32, the wiper blade-side part 15 is pushed on and only then then the spring strips 28, 30 are brought to the spacing 32 and thus inserted into the receptacles.
  • This method can of course also be advantageous for the other tolerances.
  • the receptacles 34, 36 have run-on bevels 51 in the area of the claw-like extensions 50.
  • a hot air stream 48 is blown from below onto the receptacles 34 and 36 or directly onto claw-like extensions 50 with a hot air blower 46.
  • the hot air blower 46 has a direction transmitter 52, which is designed in the form of a funnel in the exemplary embodiment. This causes the hot air stream 48 to hit both of them simultaneously Claw-like lugs 50, directed towards the spring strips 28, 30 protruding in the gap 32 and into the recess 40. The entire area is heated evenly.
  • the extent of the hot air blower 46 can be adapted in accordance with the length of the part 15 on the wiper blade side, viewed in the longitudinal direction of the wiper blade, or it can also be kept smaller and moved in the longitudinal direction.
  • a heat radiator 54 is shown as the heat source, from which heat radiation 56 is directed onto the lower region of the wiper blade 10.
  • the thermal radiation 56 is generated in the exemplary embodiment by two radiant heaters 58, such as are used, for example, in so-called reflow ovens for soldering.
  • the thermal radiation 56 has the advantage over the hot air stream 48 that no eddies, turbulence and thus no forces on the wiper blade 10 arise.
  • FIG. 7 An exemplary embodiment follows a different approach Fig. 7 , in which the heat is generated by means of an induction device 60 in the metallic spring strips 28, 30 of the support element 12.
  • the already assembled ensemble of the spring strips 28, 30 and the part 15 on the wiper blade side is moved through an induction loop 62 or the induction loop 62 is passed over the ensemble, while a high-frequency alternating current is applied to the induction loop 62, which is preferably formed on a coil.
  • Fig. 8 the already assembled ensemble of the spring strips 28, 30 and the part 15 on the wiper blade side is shown again, under which a hot plate 64 is positioned. If a distance is maintained between the plate 64 and the claw-like projections 50, the heat becomes similar to the exemplary embodiment Fig. 6 transferred by means of thermal radiation. However, it is also possible to press the plate 64 with force onto the claw-like projections 50 so that, in addition to the heating, a shaping pressure is created that closes the gap 41 or the gap 41.
  • Fig. 9 the assembled ensemble of the spring strips 28, 30 and the part 15 on the wiper blade side is positioned in a heating furnace 66 in which a defined atmosphere can prevail.
  • Fig. 10 the assembled ensemble of the spring strips 28, 30 and the part 15 on the wiper blade side is immersed in a heat bath 68.
  • the gaps 41 can close by themselves or have to be closed by applying additional force. If this further step is necessary, in the simplest case, as shown in the example Fig. 8 can be seen, a more or less strongly heated plate on the wiper blade-side part 15 is pressed.
  • the plate can be at a temperature that brings in additional heat or a cooling process already started. A permanent change in shape is achieved through cooling.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Cleaning In General (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Coating Apparatus (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)

Description

Stand der TechnikState of the art

Bei Wischblättern der im Oberbegriff des Anspruchs 1 bezeichneten Art soll das Tragelement über das gesamte vom Wischblatt bestrichene Wischfeld eine möglichst gleichmäßige Verteilung des vom Wischerarm ausgehenden Wischblatt-Anpressdrucks an der Scheibe gewährleisten. Durch eine entsprechende Krümmung des unbelasteten Tragelements - also wenn das Wischblatt nicht an der Scheibe anliegt - werden die Enden der im Betrieb des Wischblatts vollständig an der Scheibe angelegten Wischleiste durch das dann gespannte Tragelement zur Scheibe belastet, auch wenn sich die Krümmungsradien von sphärische gekrümmten Fahrzeugscheiben bei jeder Wischblattposition ändern. Die Krümmung des Wischblatts muss also etwas stärker sein als die im Wischfeld an der zu wischenden Scheibe gemessene stärkste Krümmung. Am Tragelement ist eine Anschlussvorrichtung befestigt, über die die Verbindung zum Wischerarm hergestellt wird.In the case of wiper blades of the type identified in the preamble of claim 1, the support element is intended to ensure the most uniform possible distribution of the wiper blade contact pressure on the windshield over the entire wiping area swept by the wiper blade. Due to a corresponding curvature of the unloaded support element - i.e. when the wiper blade is not in contact with the window - the ends of the wiper strip, which is fully applied to the window during operation of the wiper blade, are loaded by the then tensioned support element to the window, even if the radii of curvature differ from spherical curved vehicle windows change at each wiper blade position. The curvature of the wiper blade must therefore be somewhat greater than the greatest curvature measured in the wiping field on the windshield to be wiped. A connection device is attached to the support element, via which the connection to the wiper arm is established.

Aus der EP 0914269 B1 ist es bekannt, die Anschlussvorrichtung mittels einer Schweißverbindung am Tragelement zu befestigen. Dazu wird das entweder aus Metall oder einem Kunststoff bestehende wischblattseitige Verbindungselement auf das Tragelement aufgebracht oder aufgeschoben und mittels einer Widerstandsschweißung im Falle eines metallenen Verbindungselements oder mittels einer Ultraschallschweißung im Falle eines Kunststoff-Verbindungselements stoffschlüssig mit dem Tragelement verbunden. Diese Schweißverbindung ist im Alltag extremen Bedingungen ausgesetzt und muss hohen Drehmomenten und Vibrationen auch bei unterschiedlichen Witterungsbedingungen standhalten Insbesondere bei den in großen Stückzahlen hergestellten Wischblättern stellt eine Schweißverbindung hohe Qualitätsanforderungen an die Prozessführung und verteuert damit das Wischblatt, was gerade bei Massenprodukten zu vermeiden ist.From the EP 0914269 B1 it is known to fasten the connection device to the support element by means of a welded connection. For this purpose, the connecting element on the wiper blade side, which is either made of metal or a plastic, is applied or pushed onto the support element and bonded to the support element by means of resistance welding in the case of a metal connecting element or by means of ultrasonic welding in the case of a plastic connecting element. This welded connection is exposed to extreme conditions in everyday life and has to withstand high torques and vibrations even in different weather conditions.A welded connection places high quality requirements on the process management, especially with wiper blades manufactured in large numbers, and thus makes the wiper blade more expensive, which should be avoided especially with mass-produced products.

Ein Verfahren nach dem Oberbegriff des Anspruchs 1 ist beispielsweise aus der DE 10 2009 002 411 A1 bekannt. Weiterer Stand der Technik ist aus der WO 2005/102801 A1 bekannt.A method according to the preamble of claim 1 is for example from DE 10 2009 002 411 A1 known. Further prior art is from WO 2005/102801 A1 known.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Verfahren zum Herstellen eines Wischblatts nach Anspruch 1 hat den Vorteil, dass sich das Wischblatt sehr kostengünstig herstellen lässt. In der Regel besteht das Tragelement aus gezogenen oder gewalzten Schienen, die kostenneutral in engen Toleranzen bezogen werden können, während das wischblattseitige Teil aus Blech gefaltet oder spritzgegossenen ist. Auch in diesem Fall sind in die notwendigen Toleranzen problemlos darzustellen. Dadurch, dass nach dem Zusammenfügen der Teile eine Wärmebehandlung erfolgt, ist es jedoch nicht notwendig auf sehr enge Toleranzen zu achten. Die Wärmebehandlung stellt sicher, dass sich die Elemente des Tragelements und des wischblattseitigen Teils eng aneinander anlegen und zumindest einen kraftschlüssigen Verbund schaffen. Durch eine entsprechende Oberflächenbeschaffenheit oder auch Stoffauswahl kann auch erreicht werden, dass sich die Teile ineinander verkrallen oder gar miteinander verkleben.The method according to the invention for producing a wiper blade according to claim 1 has the advantage that the wiper blade can be produced very inexpensively. As a rule, the support element consists of drawn or rolled rails, which can be obtained at no cost within narrow tolerances, while the part on the wiper blade side is folded or injection-molded from sheet metal. In this case, too, the necessary tolerances can be easily represented. Because heat treatment takes place after the parts have been joined, it is not necessary to pay attention to very tight tolerances. The heat treatment ensures that the elements of the support element and the part on the wiper blade side are in close contact with one another and create at least a non-positive bond. A corresponding surface quality or choice of material can also ensure that the parts claw into one another or even stick together.

Bevorzugt wirkt die Wärmebehandlung auf krallenartige Ansätze des wischblattseitigen Teils, die sich in ihrer Form und/oder Ausdehnung so verändern, dass sie sich eng an das Tragelement anlegen.The heat treatment preferably acts on claw-like attachments of the part on the wiper blade side, which change in their shape and / or expansion in such a way that they lie tightly against the support element.

Wird die Wärmebehandlung auf das Tragelement gerichtet, insbesondere auf die untere Seite des Tragelements, wirkt die Wärme von innen und damit direkt im Kontaktbereich zwischen dem Tragelement und dem wischblattseitigen Teil und verbessert damit den Verbund.If the heat treatment is directed to the support element, in particular to the lower side of the support element, the heat acts from the inside and thus directly in the contact area between the support element and the part on the wiper blade side and thus improves the bond.

Besonders einfach kann die Wärme eingebracht werden, wenn sie in Form von geblasener Heißluft auf die Stellen gerichtet wird, die erwärmt werden sollen.The heat can be brought in particularly easily if it is directed in the form of blown hot air onto the areas that are to be heated.

Ist es notwendig, die Wärme möglichst ohne weitere Einflüsse einzubringen, kann die Wärmebehandlung in Form von Wärmestrahlung erfolgen. Ist aber auch möglich, beispielsweise das Tragelement, sofern dieses aus einem Metall besteht, induktiv zu erwärmen und so die Wärme gezielt von innen nach außen in einem definierten Bereich zu leiten.If it is necessary to introduce the heat without any further influences, the heat treatment can take place in the form of thermal radiation. However, it is also possible, for example, to inductively heat the support element, if it is made of a metal, and thus to conduct the heat in a targeted manner from the inside to the outside in a defined area.

Erfolgt die Wärmebehandlung mittels einer heißen Platte, so kann diese lediglich in einem Abstand von den zu erwartenden Teilen gehalten werden oder auch in den direkten Kontakt gelangen. Im Letzteren Fall, ist es möglich formgebenden auf die Elemente des Tragelements und/oder des wischblattseitigen Teils der Anschlussvorrichtung einzuwirken und den Verbund zu verbessern.If the heat treatment is carried out by means of a hot plate, this can only be kept at a distance from the parts to be expected or can also come into direct contact. In the latter case, it is possible to have a shaping effect on the elements of the support element and / or the part of the connection device on the wiper blade side and to improve the bond.

Sehr schonend kann die Wärmebehandlung über ein Wärmebad erfolgen, durch das zumindest die zu erwärmenden Teile gezogen werden.The heat treatment can be carried out very gently using a heat bath through which at least the parts to be heated are drawn.

Soll eine möglichst gleichmäßige Erwärmung des gesamten Tragelement stattfinden, kann das Tragelement in einen Wärmeofen eingestellt werden.If the entire support element is to be heated as uniformly as possible, the support element can be placed in a heating furnace.

Bevorzugt werden die erwärmten Teile im Anschluss an die Wärmebehandlung formgebenden bearbeitet, insbesondere aufeinander gepresst. Dadurch verringern sich die Spalte und es ergibt sich eine kraftschlüssige und oder formschlüssige Verbindungen. Während des aufeinander Treffens kann bereits eine Kühlung der erwärmten Teile stattfinden, so dass eine tretende Formgebung erreicht wird.After the heat treatment, the heated parts are preferably processed in a shaping manner, in particular pressed onto one another. This reduces the gap and there is a force-fit and / or form-fit connection. During the meeting, the heated parts can already be cooled, so that a stepping shape is achieved.

Die Verbindung zwischen Tragelement und dem wischblattseitigen Teil der Anschlussvorrichtung kann verbessert werden, wenn in den Bereich zwischen diesen Teilen ein Stoff eingebracht ist, der während der Wärmebehandlung aushärtet, und/oder aufquillt und/oder verklebt. Dieser Stoff kann sich dann in kleinsten Ritzen verkrallen und den Verbund erheblich verbessern.The connection between the support element and the part of the connection device on the wiper blade side can be improved if a substance is introduced into the area between these parts which hardens and / or swells and / or sticks during the heat treatment. This material can then claw into the smallest cracks and improve the bond considerably.

Das Aufbringen des wischblattseitigen Teils der Anschlussvorrichtung auf das Tragelement insbesondere vor der Wärmebehandlung gelingt dann besonders einfach, wenn das Tragelement aus zwei beabstandeten Federschienen besteht beziehungsweise solche aufweist, die vor dem Aufschieben des wischblattseitigen Teils aneinander angelegt werden und nach dem Positionieren des wischblattseitigen Teils auf den konkreten Abstand gebracht, also insbesondere auseinander geschoben werden.The application of the wiper blade-side part of the connection device to the support element, in particular before the heat treatment, is particularly easy if the support element consists of two spaced apart spring rails or has those that are placed against one another before the wiper blade-side part is pushed on and after the wiper-blade-side part has been positioned on the brought specific distance, so in particular are pushed apart.

Ein erfindungsgemäßes Wischblatt zum Wischen von Scheiben mit den Merkmalen des Anspruchs 14 hat den Vorteil, dass es sehr einfach hergestellt werden kann, weil die Verbindung zwischen dem Tragelement und dem wischblattseitigen Teil der Anschlussvorrichtung durch eine Wärmebehandlung in diesem Bereich deutlich verbessert wird. Dies ist deshalb besonders wichtig, weil während des Wischbetriebs insbesondere bei trockener Scheibe oder wenn Schnee auf der Scheibe liegt erhebliche Drehmomente zwischen dem Tragelement und dem wischblattseitigen Teil der Anschlussvorrichtung vorherrschen. Diese Drehmomente sind auch nicht konstant sondern regelmäßig wechselnd.A wiper blade according to the invention for wiping windows with the features of claim 14 has the advantage that it can be produced very easily because the connection between the support element and the part of the connection device on the wiper blade side is significantly improved by a heat treatment in this area. This is particularly important because during the wiping operation, especially when the windshield is dry or when there is snow on the windshield, considerable torques prevail between the support element and the part of the connection device on the wiper blade side. These torques are also not constant but change regularly.

Die zwischen dem Tragelement und dem wischblattseitigen Teil der Anschlussvorrichtung vorherrschende lichte Weite sollte, dass die Wärmebehandlung effektiv wirkt, in einemThe clear width prevailing between the support element and the part of the connection device on the wiper blade side should allow the heat treatment to work effectively in one

Toleranzband von 0 mm bis 0,5 mm, vorzugsweise von 0 mm bis 0,2 mm, mindestens jedoch von 0 mm bis 0,5 mm liegen.Tolerance band from 0 mm to 0.5 mm, preferably from 0 mm to 0.2 mm, but at least from 0 mm to 0.5 mm.

Die Maßhaltigkeit der Anordnung kann dann einfach eingehalten werden, wenn die beabstandeten Federschienen an deren enden von Endkappen abgedeckt sind, wobei mindestens eine Endkappe einen Abstandhalter aufweist.The dimensional accuracy of the arrangement can easily be maintained if the spaced apart spring rails are covered at their ends by end caps, at least one end cap having a spacer.

Eine einfache Montage ergibt sich, wenn die Anschlussvorrichtung im Bereich der Ansätze Anlaufschrägen aufweist, so dass ein einfaches einfädeln der Federschienen in diesem Bereich gewährleistet ist.A simple assembly results when the connection device has run-up bevels in the area of the lugs, so that easy threading of the spring rails in this area is guaranteed.

Zeichnungdrawing

In der Zeichnung zeigen: Figur 1 ein erfindungsgemäßes Wischblatt in perspektivischer Darstellung mit strichpunktiert angedeutetem Wischerarm und strichpunktiert angedeuteter Oberfläche einer Windschutzscheibe, Fig. 2 zeigt eine Ansicht nach II-II in Fig. 1, Fig. 3 eine schematische Darstellung der Ansicht nach Fig. 2 mit nur einer Federschiene, Fig. 4 eine schematische Ansicht in Blickrichtung IV in Fig. 1 mit nur einer Endkappe, Fig. 5 eine schematische Ansicht entsprechend Fig. 2 eines Ausführungsbeispieles mit einem Warmluftgebläse, Fig. 6 entsprechend Fig. 5 mit einer Wärmestrahlungsquelle, Fig. 7 entsprechend Fig. 5 mit einer Induktionserwärmungseinheit, Fig. 8 entsprechend Fig. 5 mit einer Heizfläche, Fig. 9 entsprechend Fig. 5 in einem Wärmeofen und Fig. 10 eine schematische seitliche Darstellung eines erfindungsgemäßen Wischblatts in einem Wärmebad.In the drawing show: Figure 1 a wiper blade according to the invention in a perspective illustration with a wiper arm indicated by dash-dotted lines and a surface of a windshield indicated by dash-dotted lines, Fig. 2 shows a view according to II-II in FIG Fig. 1 , Fig. 3 a schematic representation of the view Fig. 2 with only one spring rail, Fig. 4 a schematic view in viewing direction IV in Fig. 1 with only one end cap, Fig. 5 a schematic view accordingly Fig. 2 an embodiment with a hot air blower, Fig. 6 corresponding Fig. 5 with a source of thermal radiation, Fig. 7 corresponding Fig. 5 with an induction heating unit, Fig. 8 corresponding Fig. 5 with a heating surface, Fig. 9 corresponding Fig. 5 in a heating furnace and Fig. 10 a schematic side view of a wiper blade according to the invention in a heating bath.

Beschreibung der AusführungsbeispieleDescription of the exemplary embodiments

Ein in Figur 1 gezeigtes Wischblatt 10 weist ein bandartig langgestrecktes, federelastisches Tragelement 12 auf (Figuren 1 und 2), an dessen unteren, der Scheibe zugewandten Bandseite 13 eine langgestreckte, gummielastische Wischleiste 14 längsachsenparallel befestigt ist. An der oberen, von der Scheibe abgewandten Bandseite 11 des auch als Federschiene zu bezeichnenden Tragelements 12 ist in dessen Mittelabschnitt das wischblattseitige Teil 15 einer Anschlussvorrichtung angeordnet, mit deren Hilfe das Wischblatt 10 gelenkig mit einem in Figur 1 strichpunktiert angedeuteten Wischerarm 16 lösbar verbunden werden kann. Der in Richtung eines Doppelpfeils 18 in Figur 1 pendelnd angetriebenen Wischerarm 16 ist in Richtung eines Pfeils 24 zur zu wischenden Scheibe - beispielsweise zur Windschutzscheibe eines Kraftfahrzeugs belastet - deren Oberfläche in Figur 1 durch eine strichpunktierte Linie 22 angedeutet ist. Da die Linie 22 die stärkste Krümmung der Scheibenoberfläche darstellen soll ist klar ersichtlich, dass die Krümmung des mit seinen beiden Enden an der Scheibe anliegenden, noch unbelasteten Wischblatts stärker ist als die maximale Scheibenkrümmung (Figur 1). Unter dem Anpressdruck (Pfeil 24) legt sich das Wischblatt 10 mit seiner Wischlippe 26 über seine gesamte Länge an der Scheibenoberfläche 22 an. Dabei baut sich im aus Metall gefertigten, federelastischen Tragelement 12 eine Spannung auf, welche für eine ordnungsgemäße Anlage der Wischleiste 14 beziehungsweise der Wischlippe 26 über deren gesamte Länge an der Scheibenoberfläche 22 sowie für eine gleichmäßige Verteilung des Anpressdrucks (Pfeil 24) sorgt.An in Figure 1 The wiper blade 10 shown has a band-like elongated, resilient support element 12 ( Figures 1 and 2 ), on whose lower hinge side 13 facing the window an elongated, rubber-elastic wiper strip 14 is attached parallel to the longitudinal axis. On the upper hinge side 11 facing away from the window of the support element 12, which can also be referred to as a spring rail, the wiper blade-side part 15 of a connection device is arranged in its central section, with the aid of which the wiper blade 10 is articulated with an in Figure 1 The wiper arm 16 indicated by dash-dotted lines can be releasably connected. The direction of a double arrow 18 in Figure 1 pendulum driven wiper arm 16 is loaded in the direction of an arrow 24 to the windshield to be wiped - for example to the windshield of a motor vehicle - the surface in Figure 1 is indicated by a dot-dash line 22. Since line 22 is intended to represent the strongest curvature of the windshield surface, it is clear that the curvature of the wiper blade, which is resting against the windshield with both ends and is still unloaded, is greater than the maximum windshield curvature ( Figure 1 ). Under the contact pressure (arrow 24), the wiper blade 10 rests with its wiper lip 26 over its entire length on the window surface 22. In the process, a tension builds up in the resilient support element 12 made of metal, which ensures that the wiper strip 14 or wiper lip 26 rests properly over its entire length on the window surface 22 and ensures that the contact pressure is evenly distributed (arrow 24).

Im Folgenden soll nun auf die besondere Ausgestaltung des erfindungsgemäßen Wischblatts näher eingegangen werden.The special embodiment of the wiper blade according to the invention will now be discussed in greater detail below.

In Fig. 2 ist erkennbar, dass das Tragelement 12 aus zwei, voneinander getrennten Federleisten 28 und 30 aufgebaut ist, die zueinander beabstandet sind und einen Spalt 32 begründen. Die Anschlussvorrichtung 15 weist in einem unteren Bereich zwei u-förmige Aufnahmen 34 und 36 auf, in denen die Federleisten 28 und 30 aufgenommen sind. Die Aufnahmen 34 und 36 umfassen die Federleisten 28 und 30 jeweils über einen größeren Teil ihres Querschnitt, wobei der mit dem Wischerarm 16 korrespondierende Teil der Anschlussvorrichtung 15 auf der konvexen Seite 29 des Tragelements 12 angeordnet ist, während die konkave Seite 31 dieser gegenüberliegt. Zwischen den Federleisten 28, 30 und der jeweiligen Aufnahme 34, 36 besteht ein kleiner Spalt 41.In Fig. 2 it can be seen that the support element 12 is constructed from two spring strips 28 and 30 which are separate from one another and which are spaced apart from one another and form a gap 32. In a lower area, the connection device 15 has two U-shaped receptacles 34 and 36, in which the spring strips 28 and 30 are received. The receptacles 34 and 36 each encompass the spring strips 28 and 30 over a larger part of their cross-section, the part of the connection device 15 corresponding to the wiper arm 16 being arranged on the convex side 29 of the support element 12, while the concave side 31 lies opposite it. There is a small gap 41 between the spring strips 28, 30 and the respective receptacle 34, 36.

In Fig. 3 ist die Anschlussvorrichtung 15 schematisch dargestellt, wobei in der Aufnahme 34 die entsprechende Federleiste 28 eingezeichnet ist, während die Federleiste 30, nicht in der entsprechenden Aufnahme 36 liegt, so dass die lichte Weite 42 zu sehen ist. Es ist erkennbar, dass die Aufnahmen 34 und 36 die Federleisten 28 und 30 passend umgreifen, wobei auf die vorliegenden Toleranzen später eingegangen wird. Im Bereich oberhalb der Federleisten 28 und 30 sowie oberhalb des Spalts 32 weist die Anschlussvorrichtung 15 eine Aussparung 40 auf, in die, wenn das Wischblatt 10 zusammengebaut ist, ein Kopfteil einer Wischleiste 14 zu liegen kommt.In Fig. 3 the connection device 15 is shown schematically, the corresponding spring strip 28 being drawn in the receptacle 34, while the spring strip 30 is not located in the corresponding receptacle 36 so that the clear width 42 can be seen. It can be seen that the receptacles 34 and 36 suitably encompass the spring strips 28 and 30, the present tolerances being discussed later. In the area above the spring strips 28 and 30 and above the gap 32, the connection device 15 has a recess 40 in which a head part of a wiper strip 14 comes to rest when the wiper blade 10 is assembled.

Das in Fig. 4 von unten dargestellte Wischblatt 10, das ohne die Wischleiste 14 bzw. Wischerlippe 26 gezeichnet ist, zeigt die Federleisten 28 und 30, den Spalt 32 sowie die Aufnahmen 34 und 36 der Anschlussvorrichtung 15. Es ist erkennbar, dass bei dieser Ausführungsform des Wischblatts 10 die Federleisten 28 und 30 vollständig voneinander getrennt sind und lediglich durch die Anschlussvorrichtung 15 bzw. über Endkappen 38, von denen in Fig. 4 nur eine an einem Ende gezeichnet ist, zusammengehalten werden. Zumindest eine der Endkappen 38 weist einen Abstandhalter 39 auf, der in montiertem Zustand die Federleisten 28, 30 auf dem Abstand des Spalts 32 hält.This in Fig. 4 The wiper blade 10 shown from below, which is drawn without the wiper strip 14 or wiper lip 26, shows the spring strips 28 and 30, the gap 32 and the receptacles 34 and 36 of the connection device 15. It can be seen that in this embodiment of the wiper blade 10 the Spring strips 28 and 30 completely apart are separated and only by the connection device 15 or via end caps 38, of which in Fig. 4 only one drawn on one end must be held together. At least one of the end caps 38 has a spacer 39 which, in the assembled state, holds the spring strips 28, 30 at the spacing of the gap 32.

Bei dem erfindungsgemäßen Verfahren wird nun das wischblattseitige Teil 15 der Anschlussvorrichtung 20 auf das Tragelement 12 aufgeschoben, wozu das wischblattseitige Teil 15 im Bereich der Aufnahmen 34, 36 eine lichte Weite 42 aufweist, die gleich oder geringfügig größer ist als die Dicke der Federleisten 28, 30. Dazu ist die lichte Weite ungefähr 0 mm bis mindestens 0,05 mm größer als die Dicke der Federleisten 28, 30. Die Montage wird einfacher, wenn das zulässige Toleranzband im Bereich von 0 mm bis 0,2 mm liegt, wobei dann jedoch erhöhte Anforderungen an die Wärmebehandlung stellen sind. Eine sehr einfache Montage kann erfolgen, wenn das Toleranzband zwischen 0 mm bis 0,5 mm liegt wobei dann davon auszugehen ist, dass zusätzliche Maßnahmen zur Verringerung des Spalts nach der Wärmebehandlung notwendig werden. Insbesondere bei kleinen Spalten 41 ist die Montage des wischblattseitigen Teils 15 auf die Federleisten 28, 30 der Art zu vollziehen, dass die Federleisten 28, 30 unter Verringerung der Spaltes 32 in die lichte Weiten nebeneinander gehalten werden, das wischblattseitige Teil 15 aufgeschoben wird und erst dann die Federleisten 28, 30 auf denen Abstand 32 gebracht und damit in die Aufnahmen eingeschoben werden. Dieses Verfahren kann natürlich auch bei den anderen Toleranzen von Vorteil sein.In the method according to the invention, the part 15 of the connection device 20 on the wiper blade side is pushed onto the support element 12, for which the part 15 on the wiper blade side has a clear width 42 in the region of the receptacles 34, 36 which is equal to or slightly greater than the thickness of the spring strips 28, 30. For this purpose, the clear width is approximately 0 mm to at least 0.05 mm larger than the thickness of the spring strips 28, 30. Assembly is easier if the permissible tolerance range is in the range from 0 mm to 0.2 mm, but then there are increased demands on the heat treatment. A very simple assembly can take place if the tolerance band is between 0 mm and 0.5 mm, in which case it can be assumed that additional measures to reduce the gap are necessary after the heat treatment. In particular with small gaps 41, the assembly of the wiper blade-side part 15 on the spring strips 28, 30 is to be carried out in such a way that the spring strips 28, 30 are held next to one another in the clear widths while reducing the gap 32, the wiper blade-side part 15 is pushed on and only then then the spring strips 28, 30 are brought to the spacing 32 and thus inserted into the receptacles. This method can of course also be advantageous for the other tolerances.

Um das ineinander Einführen von wischblattseitigen Teil und Federschienen 28, 30 zu erleichtern, weisen die Aufnahmen 34, 36 im Bereich der krallenartigen Ansätze 50 Anlaufschrägen 51 auf.In order to facilitate the insertion of the part on the wiper blade side and spring rails 28, 30 into one another, the receptacles 34, 36 have run-on bevels 51 in the area of the claw-like extensions 50.

Sobald Tragelement 12 und wischblattseitiges Teil 15 zueinander die richtige Position eingenommen haben, wird mit einer Wärmebehandlung begonnen, die entweder auf das wischblattseitige Teil 15 oder auf das Tragelement 12 oder auch auf beide Elemente gerichtet ist. Dadurch verändert sich die lichte Weite 44 der Art, dass sie den Spalt 41 ganz oder zumindest weit gehend verschließt.As soon as the support element 12 and the part 15 on the wiper blade side have assumed the correct position with respect to one another, a heat treatment is started which is directed either to the part 15 on the wiper blade side or to the support element 12 or to both elements. As a result, the clear width 44 changes in such a way that it completely or at least largely closes the gap 41.

In Fig. 5 ist dargestellt, wie mit einem Heißluftgebläse 46 ein heißer Luftstrom 48 von unten auf die Aufnahmen 34 und 36 bzw. direkt auf krallenartigen Ansätze 50 geblasen wird. Das Heißluftgebläse 46 weist dazu einen Richtungsgeber 52 auf, der Ausführungsbeispiel trichterförmig ausgestaltet ist. Dadurch wird der heißer Luftstrom 48 gleichzeitig auf beide krallenartigen Ansätze 50, auf die im Spalt 32 herausragenden Federleisten 28, 30 und in die Aussparung 40 gerichtet. Der gesamte Bereich wird damit gleichmäßig erwärmt.In Fig. 5 it is shown how a hot air stream 48 is blown from below onto the receptacles 34 and 36 or directly onto claw-like extensions 50 with a hot air blower 46. For this purpose, the hot air blower 46 has a direction transmitter 52, which is designed in the form of a funnel in the exemplary embodiment. This causes the hot air stream 48 to hit both of them simultaneously Claw-like lugs 50, directed towards the spring strips 28, 30 protruding in the gap 32 and into the recess 40. The entire area is heated evenly.

Das Heißluftgebläse 46 kann in seiner Ausdehnung entsprechend der Länge des wischblattseitigen Teils 15 in Längsrichtung des Wischblatts gesehen angepasst sein oder auch kleiner gehalten und in Längsrichtung verfahren werden.The extent of the hot air blower 46 can be adapted in accordance with the length of the part 15 on the wiper blade side, viewed in the longitudinal direction of the wiper blade, or it can also be kept smaller and moved in the longitudinal direction.

In einem weiteren Ausführungsbeispiel nach Fig. 6 ist als Wärmequelle ein Wärmestrahler 54 dargestellt, von dem ausgehend Wärmestrahlung 56 auf den unteren Bereich des Wischblatts 10 gerichtet ist. Die Wärmestrahlung 56 wird im Ausführungsbeispiel durch zwei Heizstrahler 58 erzeugt, wie sie beispielsweise in sogenannten Reflow -Öfen beim Löten eingesetzt werden. Die Wärmestrahlung 56 besitzt gegenüber dem heißen Luftstrom 48 den Vorteil, dass keine Verwirbelungen, Turbulenzen und damit keine Kräfte auf das Wischblatt 10 entstehen. Nachteilig kann es jedoch sein, dass die Wärme insgesamt nur direkt von unten einwirkt, während sich der heiße Luftstrom 48 bis in die Aussparung 40 fortpflanzen kann.In a further embodiment according to Fig. 6 a heat radiator 54 is shown as the heat source, from which heat radiation 56 is directed onto the lower region of the wiper blade 10. The thermal radiation 56 is generated in the exemplary embodiment by two radiant heaters 58, such as are used, for example, in so-called reflow ovens for soldering. The thermal radiation 56 has the advantage over the hot air stream 48 that no eddies, turbulence and thus no forces on the wiper blade 10 arise. However, it can be disadvantageous that the overall heat only acts directly from below, while the hot air stream 48 can propagate into the recess 40.

Einen anderen Weg geht ein Ausführungsbeispiel nach Fig. 7, bei dem die Wärme mittels einer Induktionsvorrichtung 60 in den metallischen Federleisten 28, 30 des Tragelements 12 erzeugt wird. Dazu wird das bereits zusammengesetzte Ensemble aus den Federleisten 28, 30 und dem wischblattseitigen Teil 15 durch eine Induktionsschleife 62 bewegt bzw. die Induktionsschleife 62 über das Ensemble geführt, während ein hochfrequenter Wechselstrom an der Induktionsschleife 62, die bevorzugt an Spule ausgebildet ist, anliegt.An exemplary embodiment follows a different approach Fig. 7 , in which the heat is generated by means of an induction device 60 in the metallic spring strips 28, 30 of the support element 12. For this purpose, the already assembled ensemble of the spring strips 28, 30 and the part 15 on the wiper blade side is moved through an induction loop 62 or the induction loop 62 is passed over the ensemble, while a high-frequency alternating current is applied to the induction loop 62, which is preferably formed on a coil.

In Fig. 8 ist wieder das bereits zusammengesetzte Ensemble aus den Federleisten 28, 30 und dem wischblattseitigen Teil 15 dargestellt, unter dem eine heiße Platte 64 positioniert ist. Wird ein Abstand zwischen der Platte 64 und den krallenartigen Ansätzen 50 eingehalten, so wird die Wärme ähnlich dem Ausführungsbeispiel nach Fig. 6 mittels Wärmestrahlung übertragen. Es ist jedoch auch möglich, die Platte 64 mit Kraft auf die krallenartigen Ansätze 50 zu pressen, so dass zusätzlich zur Erwärmung ein formgebender Druck entsteht, der den Spalt 41 bzw. die Spalte 41 verschließt.In Fig. 8 the already assembled ensemble of the spring strips 28, 30 and the part 15 on the wiper blade side is shown again, under which a hot plate 64 is positioned. If a distance is maintained between the plate 64 and the claw-like projections 50, the heat becomes similar to the exemplary embodiment Fig. 6 transferred by means of thermal radiation. However, it is also possible to press the plate 64 with force onto the claw-like projections 50 so that, in addition to the heating, a shaping pressure is created that closes the gap 41 or the gap 41.

In Fig. 9 ist das zusammengesetzte Ensemble aus den Federleisten 28, 30 und dem wischblattseitigen Teil 15 in einem Wärmeofen 66 positioniert, indem eine definierte Atmosphäre vorherrschen kann. In Fig. 10 ist das zusammengesetzte Ensemble aus den Federleisten 28, 30 und dem wischblattseitigen Teil 15 in einen Wärmebad 68 getaucht.In Fig. 9 the assembled ensemble of the spring strips 28, 30 and the part 15 on the wiper blade side is positioned in a heating furnace 66 in which a defined atmosphere can prevail. In Fig. 10 the assembled ensemble of the spring strips 28, 30 and the part 15 on the wiper blade side is immersed in a heat bath 68.

Je nach Art der Wärmeeinbringung und/oder der Vorbereitung der Federleisten 28, 30 bzw. des wischblattseitigen Teils 15 können sich die Spalte 41 von selbst verschließen oder müssen durch zusätzlichen Kraftaufwand verschlossen werden. Ist dieser weitere Schritt notwendig, kann im einfachsten Fall, wie das im Beispiel nach Fig. 8 zu sehen ist, eine mehr oder weniger stark erwärmte Platte am wischblattseitigen Teil 15 eingepresst werden. Die Platte kann eine Temperatur aufweisen, die zusätzlich Wärme einbringt oder bereits ein Abkühlungsvorgang in Gang gesetzt. Durch die Abkühlung wird eine bleibende Formänderung erzielt.Depending on the type of heat input and / or the preparation of the spring strips 28, 30 or the part 15 on the wiper blade side, the gaps 41 can close by themselves or have to be closed by applying additional force. If this further step is necessary, in the simplest case, as shown in the example Fig. 8 can be seen, a more or less strongly heated plate on the wiper blade-side part 15 is pressed. The plate can be at a temperature that brings in additional heat or a cooling process already started. A permanent change in shape is achieved through cooling.

In allen Verfahren nach den Ausführungsbeispielen ist es möglich, einen zusätzlichen Stoff 70 in die lichte Weite 42 einzubringen, der während der Wärmebehandlung aushärtet und/oder aufquillt und/oder die Federleisten 28, 30 mit dem wischblattseitigen Teil 15 verkleben.In all of the methods according to the exemplary embodiments, it is possible to introduce an additional substance 70 into the clear width 42, which material hardens and / or swells during the heat treatment and / or glues the spring strips 28, 30 to the part 15 on the wiper blade side.

Claims (14)

  1. Method for producing a wiper blade having a supporting element (12) and a connection device (20), which is fastened to the supporting element (12) by means of a part (15) on a wiper blade side, said part having claw-like shoulders (50) which engage at least in regions around the supporting element (12), wherein the part (15) on the wiper blade side is pushed onto and positioned on the supporting element (12) with an only slightly larger clear width (42) than the thickness of the supporting element (12) and, after the positioning, is heat treated, characterized in that the heat treatment ensures that the elements of the supporting element (12) and of the part (15) on the wiper blade side lie tightly against one another and produce a force-fitting assembly.
  2. Method according to Claim 1, characterized in that the heat treatment acts on the claw-like shoulders (50) from a lower side.
  3. Method according to either of the preceding claims, characterized in that the heat treatment acts on the supporting element (12) from a lower side.
  4. Method according to one of the preceding claims, characterized in that the heat treatment takes place in the form of blown hot air (48).
  5. Method according to one of the preceding claims, characterized in that the heat treatment takes place in the form of heat radiation (56).
  6. Method according to one of the preceding claims, characterized in that the heat treatment takes place in inductive form (60, 62).
  7. Method according to one of the preceding claims, characterized in that the heat treatment takes place by means of a hot plate (64).
  8. Method according to one of the preceding claims, characterized in that the heat treatment takes place by means of a heat bath (68).
  9. Method according to one of the preceding claims, characterized in that the supporting element (12) is brought into a heating furnace (66) for the heat treatment.
  10. Method according to one of the preceding claims, characterized in that the shoulders (50) are pressed during or after the heat treatment.
  11. Method according to one of the preceding claims, characterized in that, after the heat treatment, the shoulders (50) are pressed and cooled by a cooling device.
  12. Method according to one of the preceding claims, characterized in that a substance (70) which hardens and/or swells and/or adhesively bonds during the heat treatment is introduced into the clear width (42).
  13. Method according to one of the preceding claims, characterized in that the supporting element (12) has two spaced-apart spring rails (28, 30) which are placed on one another before the part (15) on the wiper blade side is pushed on and are brought to the correct spacing (32) after the part (15) on the wiper blade side has been positioned.
  14. Wiper blade produced according to a method of the preceding claims.
EP12705835.2A 2011-02-24 2012-02-16 Method for producing wiper blades and wiper blade for wiping panes Active EP2678198B1 (en)

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DE102011004628A DE102011004628A1 (en) 2011-02-24 2011-02-24 Wiper blade for cleaning windows, especially of motor vehicles
PCT/EP2012/052708 WO2012113712A1 (en) 2011-02-24 2012-02-16 Method for producing wiper blades and wiper blade for wiping panes

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EP (1) EP2678198B1 (en)
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US20140304935A1 (en) * 2013-04-12 2014-10-16 Federal-Mogul Corporation Windscreen wiper device
DE102013217983A1 (en) * 2013-09-09 2015-03-26 Robert Bosch Gmbh Windscreen wiper device with improved creep behavior
WO2015069891A1 (en) * 2013-11-06 2015-05-14 Federal-Mogul Motorparts Corporation Rear windscreen wiper device
FR3063948B1 (en) * 2017-03-14 2024-09-20 Valeo Systemes Dessuyage BENDING ORGAN FOR WIPING BLADE

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CN103380031B (en) 2016-07-13
US20130333150A1 (en) 2013-12-19
DE102011004628A1 (en) 2012-08-30
EP2678198A1 (en) 2014-01-01
CN103380031A (en) 2013-10-30
BR112013020215A2 (en) 2017-11-14
WO2012113712A1 (en) 2012-08-30

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